<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader @addTodo="addTodo"></MyHeader>
        <MyList :todos="todos"></MyList>
        <MyFooter
          :todos="todos"
          @handleCheckAll="handleCheckAll"
          @clearAll="clearAll"
        ></MyFooter>
      </div>
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader.vue'
import MyList from './components/MyList.vue'
import MyFooter from './components/MyFooter.vue'

export default {
  name: 'App',
  components: {
    MyHeader, MyList, MyFooter
  },
  data() {
    return {
      todos: JSON.parse(localStorage.getItem('todos')) || []
    }
  },
  mounted() {
    this.$bus.$on('checkTodo', this.checkTodo)
    this.pubId = pubsub.subscribe('deleteTodo', this.deleteTodo)
  },
  beforeDestroy() {
    this.$bus.$off('checkTodo')
    pubsub.unsubscribe(this.pubId)
  },
  methods: {
    //添加
    addTodo(todoObj) {
      console.log('我接收了数据', todoObj);
      this.todos.unshift(todoObj)
    },
    //勾选或者取消勾选一个todo
    checkTodo(id) {
      this.todos.forEach((todo) => {
        if (todo.id === id) {
          todo.done = !todo.done;
        }
      })
    },
    //删除( _表示占位，因为消息订阅传递两个参数，第一个是msgName，这个方法没有使用到这个参数
    deleteTodo(_, id) {
      this.todos = this.todos.filter(todo => {
        return todo.id !== id
      })
    },
    //全选或者全不选
    handleCheckAll(done) {
      // const isAllChecked = this.todos.every(todo => {
      //   return todo.done
      // })
      this.todos.forEach(todo => {
        todo.done = done
      })
    },
    //清空已完成的todo
    clearAll() {
      this.todos = this.todos.filter(todo => {
        return !todo.done
      })
    }
  },
}
</script>

<style scoped>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>

